According to Tell MAMA, an organisation which records anti-Islamic hate crime in the UK, two major mosques in London at Finsbury Park and Tower Hamlets have received threats and hate emails and letters.
The mosque at Finsbury Park received 15 emails and letters with some of them carrying cartoons of the Prophet Muhammad, considered as un-Islamic by Muslims, the Sky News reported.
"Some of the letters made death threats against our community, so it's quite frightening for our community and our mosque," the General Secretary of Finsbury Park Mosque, Mohammed Kozar, was quoted as saying by the Sky News.
He said, "There is a vast amount of online hate around but we've also had street-based incidents reported to us, particularly from mosques.
"We're also having members of the public - particularly visible Muslim women - who are unfortunately coming back to us saying people are saying things to them again around the 'Charlie Hebdo' affair; saying things like 'I'm Charlie - you are not'.